<em>GlobalKey&lt;NavigatorState&gt;</em> <s>_navigatorKey</s> = <em>new</em> <q>GlobalKey( )</q>;

<em>NavigatorState</em> 	v	=  <s>_navigatorKey</s>. <i>currentState</i>;			<em>// 当前状态 ==</em> <q>Navigator.of(context)</q>
<em>Widget</em> 			v 	=  <s>_navigatorKey</s>. <i>currentWidget</i>;		<em>// 当前控件</em>
<em>BuildContext</em> 		v 	=  <s>_navigatorKey</s>. <i>currentContext</i>;		<em>// 当前上下文</em>
	
MaterialApp(
	<b>navigatorKey</b>: 	<s>_navigatorKey</s>
),